According to this reliable source(in Turkish but there is a clear picture), the Radeon 6990 will have 1.5TFlops of double precision and considering the size of current wus, is there a plan to integrate several wus into one for 69xx series cards?


http://www.donanimhaber.com/ekran-karti/haberleri/amd-radeon-hd-6970-ve-radeon-hd-6990in-teknik-ozellikleri-ortaya-cikti.htm

The 69x0 series is rumored to have 1/4 the FP32 performance for FP64.
The 6990 consists of two Cayman cores.
It may take less than 1 1/2 minutes to complete even the longer work units.